Signals and indicators – Alarms – Fluid-pressure variation
Patent
1987-11-13
1989-05-02
Shoop, Jr., William M.
Signals and indicators
Alarms
Fluid-pressure variation
116 67R, 137557, 12820222, F16K 3700
Patent
active
048258024
ABSTRACT:
An alarm system for a respirator fed from a supply of gas under pressure comprises a control valve having a pilot port and feed ports displaceable between an open position permitting fluid flow between the feed ports and a closed position preventing such flow. A pilot line connected to the pilot port is also operatively connected to the respirator for feeding gas under pressure from the respirator to the pilot port and urging the valve into one of the positions, the pressure in this pilot line being the pressure being applied to the patient. A spring is braced against the valve and urges same into the other position. A pneumatically actuatable acoustic alarm is connected to one of the feed port. Gas is fed substantially continuously under pressure to the other feed port. Thus when the pilot line pressure drops the valve moves into the other position and the alarm is either actuated or its actuation is stopped. Normally such a drop in pressure, which is indicative of equipment failure, the patient coming disconnected, or the supply running out, causes the valve to open and the alarm to sound.
REFERENCES:
patent: 3910222 (1975-10-01), Metivier
patent: 4127122 (1978-11-01), Kienhofer et al.
patent: 4176617 (1979-12-01), Pilipski
patent: 4249473 (1981-02-01), Pasternack et al.
patent: 4350115 (1982-09-01), Pasternack
patent: 4474175 (1984-10-01), Hudimac
patent: 4487155 (1984-12-01), Olesen
Dubno Herbert
Shoop Jr. William M.
Societe Anonyme Drager
Wilford Andrew
Young Brian K.
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